DOT * Stainless Steel Snap Cap Socket & 3/8" #8 Screw Stud Kit Marine Canvas - 30 Sets Caps are designed with window cutout that is folded under the post in order to minimize dimpling of the cap. They also offer caps with a stainless steel post to eliminate the need for pre-piercing tough fabrics, canvas or leathers. Caps are 24 ligne (5/8" - fitting a 3/8" socket/snap stud) Standard Post 3/16" - Standard Spring Socket Snap Screw Stud is 3/8" #8 Free First Class Ship within USA Free Returns on all non-opened products Great Customer Service - Check out our FEEDBACK!