This stand is made from billet aluminum and is threaded on both ends, 5/16-18" on the blower side and 3/8-16" on the belt guard side, to mount a belt guard or starter bracket on to your supercharger. Finish is machined aluminum. The 1.75" stand is generally used with the short 4.00" snout and the 3.00" stand with a 5.00" snout. Stands are sold individually and most roots blowers use four standoffs per set up. Longer snouts should use a blower snout clamp.