This line of Backstops / Turnstiles is made with high strength, guaranteeing its full operation in high torque requests. These models are provided with two lateral bearings, allowing constant concentricity between the hub, locking core and cap, thus obtaining the highest performance of the product. The TTFR line is supplied with lateral keyways on both sides of the cover, which allows it to be perfectly locked in the housing. Note: TTFR Backstops, with a diameter of 8 to 20, do not have side bearings. However, its system of internal guides allows the perfect assembly and performance of the product.