Adjusting shoulder bump has never been easier. The Whidden Gunworks Click Adjustable Full Length Sizer Die and lock ring work together to give the user a clicking feel to the adjustment just like a high end rifle scope. Each click moves the shoulder bump .001" so you can easily find the exact shoulder bump that you desire. Included with the Click Adjustable Sizer Die is a Shoulder Bump Gauge. This gauge attaches to standard calipers and allows measurement from the case shoulder to the base. Using the Shoulder Bump Gauge with the Click Adjustable Sizer Die will make the proper sizer die setup easier than ever before. Mfg: Whidden Gunworks