Stainless steel 5/16" BSCY 26 TPI small hex bolts and setscrews. 1/4BS / 3/16W spanner size. All fully threaded setscrews apart from the 1 1/8" length (see image) which is a part threaded bolt. The 1 1/8" bolt is used on some vintage motorcycles handlebar clamps. The 2" setscrew is used on some vintage motorcycles as chain adjusters. All have a shallow domed head and are vibratory polished.