Chadwick & Trefethen Angle Blade Expanding Choke Reamer B Nut

For 10, 12, 16, 20 and 28 gauge, plus .410 choke reaming. Blade angle eliminates chatter; each cut is clean and controlled. Barrel Hone and Caliper below are integral parts of the process and should be included in your equipment. "A" and "B" reamers are especially useful in fitting 1911 Auto barrel bushings. Mfg: Chadwick & Trefethen SPECS: Overall dimensions and expansion range as follows: A - 5-5/8" (14.2mm) long, .218" (5.5mm) square shank, .468" - .531". B - 5-A 3/4" long, .282" sq. shank. .531"-.593".