Fangrui Product Details [ 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 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:b: Blue Material:a