Extra parts for attaching elastic straps or making your own.  Full kit includes four(4) each of clips and screws, with nuts and inserts as needed.  Straps not included.  

Screw Parts Kit includes four(4) each of either

• 10-32 slotted nylon screws and nuts in black or white, with inserts for converting suction cup mounting holes into screw attachment holes
• 10-24 white hex socket screws with 1/8" nylon spacers, for flush-mounted keyguards

3/8" screws are the standard size supplied with strap kits for use with 1/8" thick keyguards.  To use the kit with thicker keyguards, you'll need the 1/2" long screws.