Fixed scribing without dislocation Fixed pen in the middle, drawing while pushing, easy scribing The steel wheel is and wear-resistant. The steel wheel is with contour, and the scribing is Hold the pen head firmly in the middle of the pen with fixed spacing, and draw while sliding Both ends can be . One end is pulley, and the other end is pointer. Both ends can be The collet can move up and down The pen collet can move up and down in the middle, which is convenient for changing the shape taking end The metal ruler body is resistant to pressure and . The metal ruler body is sturdy and durable, and it is fixed with clips inside Material: ABS Color: as shown Package Contents: 1 x irregular radian ruler Only the above package content, other are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.