Model 2-S Spiral Ratchet Reamer â€“ Self-feeding spiral design for extra-fast and easy hand reaming. Model 2-S Reamer is not suitable for power reaming.Models 2 and 3 Ratchet Reamers â€“ Long taper design will not dig in. Suitable for use with power drives.Model 254 Spiral Ratchet Reamer â€“ Hollow center reduces weight. Large pressure plate. Hardened alloy steel cone removable for sharpening. Not suitable for power reaming.