Material: brass and stainless steel. Function: It is used to facilitate sharpening and can easily grasp the angle. Features: precision manufacturing, assurance quality, easy to use. Suitable for: carpenters, handymen, construction workers, etc. Warranty: quality assurance. If you have any questions, please feel free to contact us and we will give you a satisfactory answer. Product Description Recommended reason: The body of the caliper is made of stainless steel and does not rust. When sharpening the blade, the edge of the blade smoothly fits the oil stone, the angle is easily grasped, and the edge of the blade is sharper, more precise, and the center of gravity is stable and it is not easy to slip. Note: This product only sells sharpeners, excluding wood chisels, planers and oil stones . Product information: Clamp width: 5-82mm Product weight: 270g Roller material: brass Collet material: stainless steel Maximum chisel clamping size: 55mm Maximum planer clamping size: 82mm Width: 40mm Product details: 1. Easy to grasp the angle: when sharpening the blade, the edge of the blade fits the oil stone perfectly, easy to grasp the angle, the center of gravity is stable, and it is not easy to slip . 2. Open Retaining Ring (Stainless Steel): Ensure the pulley does not move when sharpening and always remains centered. 3. The pulley (brass) slides back and forth without any restrictions, keeping the same direction, and the sliding is smooth and safe. 4. Hand cap (stainless steel): Rotate the cap by hand to adjust the size of the clamping range. 5. Main screw (stainless steel) diameter 9.6 mm.