Features:   Made Of Aluminum Alloy Base And Thickened Plastic Bracket,Durable.   Loosen The Screws On The Base Block,Refer To The Scale Mark,You Can Adjust The Block Opening To Apply To Different Board Thickness Of The Board,Applicable Wood Thickness Range:13-36MM.   Refer To The Scale Mark To Observe The Depth Of The Trimming Knife, Adjust The Grooving Depth,Adjust And Lock The Trimmer,You Can Start Working.   The Design Of Limit Slots Can Make The Block Slide Parallel To The Grooving Process Smoothly Without Jamming And More Efficient.   When Installing The Trimmer Knife,Be Sure To Place To The Bottom And Lock It With A Wrench.   It Can Be Used For Making Mortises,Making Holes For A Hidden Hinges, Specific Joinery,And Many Other Applications.   Note:Slotting Bracket Only,Trimming Machine Is Not Included.  Specifications:   Material:Aluminum Alloy+Plastic   Color:As Shown   Size:138MMX90MMX82MM(5.43"X3.54"X3.22")   Inner Diameter:65MM(2.56")  Package Include:   1PCS X Trimmer Slotting Bracket  (Trimming Machine Is Not Included)   1PCS X 11MM Trimming Knife   1PCS X Small Wrench