Contains 3 carbide replacement cutters: 1 each for tools engraved with MSTH, MSR and MS55D. Fits mid size Simple Woodturning Tools only. ½" round carbide cutter fits Mid Size Simple Turner and Hollower (engraved MSTH) 55° diamond carbide cutter fits Mid Size Simple 55° Detailer (engraved MS55D) 10.5mm 90° square carbide cutter fits Mid Size Simple Rougher (engraved MSR) If you have purchased the Package of 3 Mid Size Simple Woodturning Tools with Interchangeable Handle, then this 3 pack of cutters will give you a replacement for each tool in that package. This package contains 1 cutter for tool MSTH, 1 90° square cutter for MSR and 1 cutter for MS55D. All cutters are carbide and are extremely sharp. Buying in a pack such as this one saves you money over buying them individually.