This kit will chamfer your revolver forcing cone to 11 degrees for easier transision from cylinder to barrel. I bought it new from Brownells and never used it. They list them at Brownells right now for $109.99, but they are out of stock. Add tax of 8 dollars and about another 10 or more for shipping, About $128 total. Will sell this one for $90 in Warner Robins. It will chamfer 38 to 45 cal. Call Wallace 478-918-5392