Usage Tips:Material: The tearing tool head has a round pull blade, please be careful when using it to avoid injury. Marker knife made of brass, aluminum alloy and stainless steel, it is durable and has a long service life. Easy to use: The dual function wheel scale can meet linear and bending needs at the same time. The 59.5mm diameter solid brass surface can slide over the edge of the workpiece and the 8mm precision polished steel rod can be used as a depth gauge. Anti-roll design : Prevents this wheel marking gauge from rolling off your workbench. It houses an anti-rolling brass fence with 2 flat points on the head to prevent the counter from rolling. Material: Scoring knife made of brass, aluminum alloy and aluminum alloy. stainless steel, it is durable and has a long service life. Features: Measuring range: 0-12cm fine adjustment: 0.2 mm. Dimensions: 21.7 x 5.95 cm (total length x maximum diameter). Customer satisfaction is our priority. If there are any problems, please feel free to , our customer service will solve any problem for you. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.