Hole Diameter: 2.5cm (1 inch)Min Diameter:3.2cmMax Diameter:4.9cm. Total Height: 18cmHeight from bottom to center of hole: 15cm. Pull Back: 3.8cm Bottom Thread Mount: 0.5 inch Coarse x 13 (13 threads/inch) Bolt. Quantity:1 Pair (2 PCS)No include install instructor. This set is made for 2.5cm (1 inch) handlebars only Chrome Billet Handlebar Risers.
