Ammco THICK Lathe Bits are designed for off-car (bench) lathes. Ammco Model Lathes 1000, 2000, 3000, 4000, 4100, 7000. The unique set includes a HD Clip-on Silencer with our exclusive Velcro Strap, HD Four Spring Silencer with Neoprene Center Cores, plus 2 Large and 2 Small Silencer Bands for Optimal Noise Reduction and Stability when used.