2 Flute chamfer bits with ball bearing guide. (Replacement bearings sold separately).Replacement bearing for AM49400 and AM49002: Part # AM47706Replacement bearing for all others: Part # AM47706Note 1: AM49404 will completely chamfer 3/4" material.Note 2: AM49406 will completely chamfer 1" material.Note 3: AM49410 cuts octagonal shapes.