Part Number: N415875. Material: carbon steel. Package Includes: as images show. 1 Impact Wrench 1/2" Anvil Assembly. Compatible with: Dewalt Black & Decker 18v & 20v Max Xr DCF899HB type1-3,DCF899HP type1-3. (Not suitable for type 4). Be Careful：Please check whether the width of the shaft of your iron post is consistent with this product.The shaft body of dcf899 type4 is relatively small, which is not suitable for installation.The replacement part number of replacement type 4 is n866410 n880093 n851276. A brand-new, unused, unopened, undamaged item in its original packaging.