Recommended speed is 20, 000 rpm Z direction feed speed 100-300 When cutting, cut in layers, and the cutting depth is 0.5-5MM at a time. When the processing speed is between 1000-3000, it is necessary to turn on the coolant or water cooling to prevent burning. The above CNC machine parameters are for reference only, please adjust according to the actual situation. size: 10 x 1 x 1cm Material: 45 gauge steel colour: As shown Package Contents: 2 x CNC stone engraving drill 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.