Drag Specialties Chrome Steel Spacer Kit DS-190000 Precut, chromed spacers in 1/8in., 1/4in., 3/8in., 1/2in., 3/4in. and 1in. lengths Designed to be used with 1/4in., 5/16in. and 3/8in. bolts Spacers with 1/4in. and 5/16in. bolt holes have .650in. outer diameter Spacers with 3/8in. bolt hole have .750in. outer diameter Replacement packs available separately; Made in the USA