Stainless Hex Head Screw, 3mm Thread, .5 pitch These fit most 36mm and 40mm brushless motors. Check with your motor manufacturer to double check size before purchase. NOTE: May require washers/shims! When used with brushless motors, make sure to not install these deep enough that the screw hit the windings!! Includes: Quantity of 1 screw. Options:6mm, 8mm, 10mm, 14mm or 20mm lengths