Easy to use, hand turned reamer opens the cylinder throat to a uniform diameter for best accuracy with lead and jacketed bullets. Removable pilots let you select the correct pilot for the closest possible fit to individual chambers..45 Cal. corrects out of spec, smaller-than-bore-diameter cylinder throats on .45 Colt and other .45 caliber revolvers. Opens throat to .4525. Provided with .4480 diameter pilot. .44 Cal. fits .44 Magnum, .44 Special and .44-40 revolvers. Opens throat to .431. Furnished with .4270 pilot. .357 Cal. from .3545 to .357. Open the throat to .358. .357 furnished with a .354 pilot. Pilot Packs contain six additional p Mfg: Manson Precision SPECS: High-speed steel. 4 (10cm) long, shank, 6 flute, helical ground.