Provided is a copper alloy fastener element which improves season cracking resistance by a means different from that of increasing a ratio of a phase. The copper alloy fastener element includes a copper-zinc alloy as a base material, the base material having: an apparent zinc content of from 34 to 38%; a dendrite structure; and a phase at a ratio of 10% or less.

Provided is a copper alloy fastener element which improves season cracking resistance by a means different from that of increasing a ratio of a phase. The copper alloy fastener element includes a copper-zinc alloy as a base material, the base material having: an apparent zinc content of from 34 to 38%; a dendrite structure; and a phase at a ratio of 10% or less.

Provided is a copper alloy fastener element which improves season cracking resistance by a means different from that of increasing a ratio of a phase. The copper alloy fastener element includes a copper-zinc alloy as a base material, the base material having: an apparent zinc content of from 34 to 38%; a dendrite structure; and a phase at a ratio of 10% or less.

Provided is a copper alloy fastener element which improves season cracking resistance by a means different from that of increasing a ratio of a phase. The copper alloy fastener element includes a copper-zinc alloy as a base material, the base material having: an apparent zinc content of from 34 to 38%; a dendrite structure; and a phase at a ratio of 10% or less.

A releasable fastener having two portions that slide together to affix two portions of an article. For example, the two portions may include an elongated rail that slides into an elongated slot or tube.

A releasable fastener having two portions that slide together to affix two portions of an article. For example, the two portions may include an elongated rail that slides into an elongated slot or tube.

A fastening system, apparatus, and/or device for interlocking a first zipper tooth and a second zipper tooth. The fastening system, apparatus, and/or device may include a slider configured to vertically interconnect a first zipper tooth with a second zipper tooth, the slider comprising a bottom zipper receptacle including a first channel at a bottom portion of the slider and extending from a back of the slider to a front of the slider, a top zipper receptacle including a second channel at a top portion of the slider and extending from a back of the slider to the front of the slider, and a finger holder extending along a top surface of the slider where the finger holder has a concave shape that is configured to receive a finger of a user.

A fastening system, apparatus, and/or device for interlocking a first zipper tooth and a second zipper tooth. The fastening system, apparatus, and/or device may include a slider configured to vertically interconnect a first zipper tooth with a second zipper tooth, the slider comprising a bottom zipper receptacle including a first channel at a bottom portion of the slider and extending from a back of the slider to a front of the slider, a top zipper receptacle including a second channel at a top portion of the slider and extending from a back of the slider to the front of the slider, and a finger holder extending along a top surface of the slider where the finger holder has a concave shape that is configured to receive a finger of a user.

This disclosure describes a releasable fastener having two portions that slide together to affix two portions of an article. For example, the two portions may include an elongated rail that slides into an elongated slot or tube.

This disclosure describes a releasable fastener having two portions that slide together to affix two portions of an article. For example, the two portions may include an elongated rail that slides into an elongated slot or tube.