Features: The tool is made of material, which is strong, wear-resistant and durable after anodic oxidation treatment. Abandoned carbide circular-arc blades make the cutting experience smoother, and the blade specification is 15 x 15x15x2.5 30R150. After the blade becomes dull, the rotating blade is as sharp as new, and the blade can be rotated for 4 times, which is economical and practical. Easy to use, loosen the screw and rotate the red tool holder to the diameter you want to make, and then re-lock the screw to immediately. Widely used in woodworking, furniture making, home DIY and other fields. describe: Name: adjustable milling tool set Circular hole specifications: 8mm, 9mm, 10mm, 12mm, 15mm, 16mm, 18mm, 20mm. Material: Metal colour: black+red Package Contents: 1 x Adjustable milling pin tool set(1 x Adjustable milling tool (pre-installed blade), 1 x T20 blade wrench, 1 x 5mm adjusting wrench, 3 x screw) 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.