This sale is for Twelve Allen Headed Bolts. These Genuine BDL round Dog bolts fit 3" open primary belt drive clutch shells. They are used on Harley-Davidson Big twin 5 speed models, and most custom's using a 5 or 6 speed transmission. They are usually replaced when the clutch is, for quiet clutch operation. They measure 2 3/8" in total length, with a shoulder length of 2". Thanks for looking and be sure to check out my other items for sale. I gladly combine shipping when possible.