Collet #1 for Case Trimmer, fits Original, and Power Trimmers.
Step dimensions = .379", .473" & .532"
Fits:
17 Remington, 222 Remington, 222 Remington Magnum, 22 Varminter, 223 Remington, 225 Winchester, 5.6x50mm Rimmed, 22-250 Remington, 220 Swift, 221 Fireball, 22 PPC, 22 BR, 243Winchester, 6mm Remington, 224 Remington, 6mm BR, 257 Roberts, 250 Savage, 25-06 Remington, 6.5x55mm Swedish Mauser, 6.5x57mm Mauser, 264 Winchester Magnum, 270 Winchester, 7x57mm Mauser, 7mm-08, 7mm TCU , 280 Remington, 7mm BR, 7mm Remington Magnum, 30-06 Springfield, 308 Winchester, 300 Winchester Magnum, 303 British, 32 Smith & Wesson Long, 7.65mm Mauser, 7.7mm Japanese, 8mm-06, 8x57mm Mauser, 333 Winchester, 338 Winchester Magnum, 340 Weatherby Magnum, 35 Remington, 358 Winchester, 380 ACP, 375 H&H Magnum, 41 Colt, 38-40 WCF, 41 Smith & Wesson, 44 Special, 44 Magnum, 44-40 WCF, 45 ACP, 45 Winchester Magnum.
For unlisted calibers use the cartridge head diameter to select the appropriate collet.