1. Lightweight, compact and easy to carry, suitable for various angle rulers 2, wide application range, stable and firm clamping 3. Tool table hole tenon stopper, common for woodworking tables 4. Triangle ruler angle marking, can be used to select the desired angle for clamping and fixing, and use a pen to draw a line 5. Use a right angle ruler as a staircase gauge, fix it with two clamps, and draw lines with a pen 6. Use a ruler to draw lines at a fixed distance, and choose the desired length to clamp and fix them. Use a pen to draw lines 7. Fix tools such as clamping table saws as a support for mountain use 8. The double head is interchangeable, and when the bottom distance is too short, it can be clamped and fixed upside down 9. Check the verticality of the wooden block by using two clamps for fixation, which can be used to stand and check the verticality Please note: the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! Model:Auxiliary clamp of tenon square Colour:A: Red 20mm/B: Red 19mm/C: Black 19mm/D: Black 20mm Material:Aluminum alloy<br><br>Package Contents: 1 x Auxiliary clamp of tenon square 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.