100% Genuine Toyo Replacement Glass Cutter Narrow Head with Trac Wheel Technology. For all Toyo Super Cutter models Except TC-21 Custom Grip. The Trac Wheel Technology incorporates in the head micro notches on the cutting edge which work like snow chains on a tire, giving your cutter traction upon initiating a score. The immediate roll of the wheel reduces skipping and flaring at the start of a score. Wheel hone angle is 140 degrees. The narrow head is designed for pattern glass cutting. Toyo# TC-70PH.