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Slow spiral bits-Helix bits are recommended for cutting hard plastics, such as acrylic and phenolics. The slow spiral angle produces less "lifting" breakout especially using brittle plastic materials. These bits also provide great finishes in hardwoods.
140 SERIES GRADE (2) FLUTE Up Slow SHEAR CARBIDE ROUTER BITS
3/8"x 1" CL Up Shear Router Bit-#140-1000
Solid Carbide Slow Spiral Router Bits - Up-Cut-3/8" x 1" CutLength Specially designed to provide an excellent finish in hardwoods, solid surface and hard plastics!
Choose Up-Cut if an excellent finish on the bottom of surface is required. Choose Down-Cut for an excellent finish on the top of surface