1/4"-20 Clamping Thumb Screw Set with Threaded Inserts for Wood Includes Hex Key Pack of 4 Screw Set Includes: 4 - 1/4"-20 Clamping Thumb Screws with Round Rosette Knob (select length in dropdown box) 4 - 1/4"-20 Threaded Inserts for Softwood 1 - Allen Wrench to Install Threaded Inserts Drill Bit Required is 23/64" Not Included Please advise if Red, Yellow, or Gray Knobs are preferred Steps: Drill hole, Insert thread with wrench (all parts included) 1/4-20 Thread. Lengths: 1/2" - 2 1/2" Thread Insert Height: 25/32 .741" (approx. 3/4") Stainless Steel 18-8 Plastic Knob Details: Clamping Knob Grip Dimensions: 1 1/2" Wide x 7/16" Thick Finger Grip does not interfere with length of Bolt These can be used to secure material without using a wrench. They can also be used for: Panels Vices Clamps Router Table Power Tools Woodworking Jigs Wood Table Clamps Removable Table Clamps Straight Edge Pieces *Hole for insert can be drilled all the way thru your table to accommodate length of bolt if needed. *The Flange on the insert is slightly wider, to keep insert from pulling in to wood table. Visit our store for additional sizes, colors, and fine threaded bolts, under, Store Category: Thumb Screws Standard. Fast and Free Shipping Made in USA