V3 Extension Board, CNC Shield Expansion Board with 4pcs A4988 Stepper Motor Driver Heat Sink for Engraver 3D Printer DC 12V to 36V auspowers_batchone The black one is with

The black one is with anti-slip rubber pad base applied to traditional sharpening stone

and minerals

For Swiss pattern files the length of the tool is the length of the blade

3/32" Thickness

V3 Extension Board, CNC Shield Expansion Board with 4pcs A4988 Stepper Motor Driver Heat Sink for Engraver 3D Printer DC 12V to 36V auspowers_batchone The black one is withV3 Extension Board, CNC Shield Expansion Board with 4pcs A4988 Stepper Motor Driver Heat Sink for Engraver 3D Printer DC 12V to 36V Package Includes: 1 x V3 Extension Board4 x Drivers4 x Heat Sinks Read more CNC Expansion Board: Version: V3. 0Size: 68 x 53 x 18mm 2. 67 x 2. 08 x 0. 7"Voltage: DC 12V to 36V (only DRV8825 driver can handle up to 36V, so please consider voltage for power supply)The V3. 0 expansion board can be used as a drive expansion