[ High quality Material ] The main body is high-strength high-quality aluminum bearings, with anodized and CNC processing, , rust proof, and wear-, with a bright and shiny exterior! [ Strong Expandability ] The feeder is divided into two types: left and right, each equipped with two sliders and two large sliders. It can be used in standard slots # 30/# 45, or can replace small sliders and be fixed on T-small slots or backrests. It can be used for more operating platforms such as Taiwanese dramas, band saws, inverted engraving machines, etc! [ Easy to operate ] Double feeding, flexible adjustment of roller height according to wood thickness! [Safe, non rebound] Bearing wheels, shock-absorbing double rollers, fixed with double sliders, under sufficient force, stable without vibration, smooth and unobstructed wood propulsion! Compared to traditional boards, with inclined angle pulleys and material guiding function: operation, non bouncing wood, high accuracy, and better stability! Colour:A:Red Material:Aluminum Alloy Package Contents: 1 set of bearing roller Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.