Reamers are carbide. Backorder Lead Time is 4-8 Weeks. Reamers use pilot bushings for standard tool steel reamers. Pilot Bushings are not included. Performance Legacy reamers are the most consistent reamers available. All key dimensions on our reamers are guaranteed to be within 4 microns or 0.0001574803” with a majority falling within 2 microns or 0.0000787402”. This means the reamer you purchase today will be virtually identical to the reamer you purchase in the future, helping to minimize inconsistencies and variabilities in the chambering process. Stealth Coating Technology Our proprietary stealth coating technology improves edge retention and incorporates a post coating process to further reduce the coefficient of friction and increase chip flow. C-Clips are included with your order but also available at McMaster-Carr 22/6mm Clip is McMaster PN 97414A615 6.5/25cal clip is McMaster PN 97431A240 7mm Clip is McMaster PN 97414A620 30Cal Clip is McMaster PN 97414A625