5/8" steel baby pin, with 5" (12.7 cm) length, is designed for fitting into the grip head and can be connected to the lighting fixtures or other grip accessories. Features a 1/4''-20 female hole on one side and a 3/8''-16 female hole on the other. Meanwhile, the knurled neck offers maximum friction and the collar design provides an anchor to prevent the pin from sliding completely through grip head.2-1/2” Grip Head - Black