Original DeWalt part 1004691-36 — hardened steel ball, diameter 7.11 mm (D 7.11 mm) — designed to sit in the hammer / rotary mechanism as the rolling / detent element that engages the spindle assembly.

Fits a number of SDS-plus rotary hammers and similar drills from the Stanley / Black & Decker / DeWalt  — for example Black & Decker KD1250K, KD1010K, BPHR323K and Stanley FME1250 / KFFMED1250 — where the part is listed as part no. 1004691-36.

Small, precision steel ball replacement for a clean repair: if your tool’s ball has flattened, chipped, or fallen out, replacing it with this original-numbered steel ball restores the correct contact and retention in the spindle / impact assembly so the hammer action and bit retention operate as intended.