Dewalt PB900B - Protective Rubber Boot for DCF900 POWER SAW Automatic Grade Matching basically means

Automatic Grade Matching basically means that the laser moves to the on-grade position on the receiver and the grade is then calculated – this is generally used when a constant fall is desired but the grade may not be known (renewing existing driveways or matching existing surfaces)

which is a common unit of measurement in surveying and engineering

Cutting Capacity - Wire Rope: 13/64"

and a full accessory kit—including an 8‑ft flex hose

As you extend the level

Dewalt PB900B - Protective Rubber Boot for DCF900 POWER SAW Automatic Grade Matching basically meansRubber material helps protect tool and work surfaces Flexible design allows for easy install and removal Custom molded design ensures proper fit and prevents slippageRubber boot for the DEWALT 20V MAX* XR 1 2 in. High Torque Impact Wrench helps protect both the tool and work surfaces from damage. For use with the DCF900 and the DCF899 only. Tool sold separately. Additional Features For use with DCF900 Impact Wrnech Includes (1) PB900B Protective Boot