Description Color Coded Scales – Imperial If you have a D3, D1258R or D1258, you can upgrade your jig with a pair of D4R Pro scales in inches. Used in conjunction with the D4R Pro User Guide, they provide easy-to-use icons and color coding for each jig mode. Note: The position of the brass knob and scale set screw indicates a left or right hand scale. Includes 5/64″ Hex Key (Item 3156). Please contact Leigh to purchase scales individually.