Product Advantages:     (1)Very Durable:The Wnewtools Featherboards is made from durable plastic and it will stand up to years of heavy use in your woodshop. (2)Two Modes (3/4" [30mm,45mm]+ 3/8"[19mm]):Includes wedge-lock system and T-bolts system that all of them will provide strong fastening. As shown in the second picture,it could fit in the most common 3/4" and 3/8" T-track . (3)Original Manufacturer:The Featherboads come with an English Instruction. (4)Professional and Safe:The professional featherboard will help you keep safe and feel like being a woodworking master when you are using router,table saw and band saw. (5)I am also a woodworker,and when I am using table saw with dado,I would use this featherboard to keep safe by preventing kickback.           Package:     (1)Featherboard *2 (2)Wedge-lock System(fit in 3/4" ( 30mm, 45mm) T-track) Wedge-lock bar *4 Long bolt *2 Short bolt *4 (3)Long T-bolt *2 (fit in 3/8" ( 19mm) T-track) Short T-bolt *4 (fit in 3/8" ( 19mm)T-track) (4)Spacer *2 + Washer *4 + M6 handle *4                 【13 Angled Fingers】: Featherboard are Made from a HIGH-TECH POLYMER and each one has 13 ANGLED FINGERS that apply steady pressure that consistently produces cleaner cuts with less chance of kickback, chattering or lifting.Featherboards is made from durable plastic and it will stand up to years of heavy use in your woodshop     【Professional & Safe】: The feather loc board can fix the wood sturdily to prevent bounce, so it is safer to use the feather board, and you don't need put your hands too close to the saw blade during the woodworking. Not only will Feather-loc protect your hands, it also helps prevent kickback, binding, and bent blades.The professional featherboard will help you keep safe and feel like being a woodworking master when you are using router, table saw and band saw.     【 Suit for Dual or Tandem Application】: The woodworking Feather Loc Board can be quickly and easily connected to a miter slot or t-slot, and can be DIY according to your needs.Mounting Hardware Included for nearly any dual or tandem application, comes with wedge-lock hardware which works in t-slots or miter slots on tablesaws, router tables, band saws and more.     【Two Modes (3/4" + 3/8")】: 4 Miter Bars are suitable for all standard 3/4" and 3/8" T-track.Includes wedge-lock system and T-bolts system that all of them will provide strong fastening.Comes with wedge-lock hardware which works in t-slots or miter slots on tablesaws, router tables, band saws and more, this feather loc board is perfect for woodwork.     【A Must Have for Woodworking】: This unique featherboard can be quickly and easily installed on a miter slot or t-slot. Easy set-up feature increases the accuracy, quality and safety of the cuts.This featherboard is a very professional woodworking tool that can be used for flip engraving machines, electric circular saws, table saws, band saws, etc.Every woodworker needs a professional featherboard,The featherboard works to keep workpiece press up against the fence whole time when you are cutting