Forster - Chamber Reamer Die Kit Sinclair Bump Gage Inserts are

Sinclair Bump Gage Inserts are used to measure the amount of case shoulder bump when setting up full length sizing dies

The tapered design ensures that the Collet securely closes on the case rim without pulling the case back

"you could drive tacks with 'em

Crafted with high-strength stainless steel and G10 grip plates

keep the ear cushions sealed firmly against your head

Forster - Chamber Reamer Die Kit Sinclair Bump Gage Inserts areAll reamers are made to SAAMI specifications. Reamers are available as Finish Reamers with a Removable (Live) Pilot. Reamers come with serrations on every other flute to help break up chips and alleviate chatter. They also come with oil grooves that allow for a better flow of cutting fluid and flushing of chips.