Clamping range: 12-26mm / 0.47-1.02in Scope of use: Round wood tenon wooden panel glued splicing Product Name: Self centering panel punching jig Note: Installation guide not included, Please check as much as possible to make sure the item is what you need. Tips:The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use. Colour:Black Material:Aluminum Alloy Package Contents: 1 * Self Centering Doweling Jig Kit 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.