The Milwaukee B taper bit adapter lets you use B taper bits in your spline drive rotary hammer for greater productivity. Get more out of your spline drive rotary hammer, including models 5318-21, 5319-21, 5321-21, 5321-22 and 5345-21, with this heavy-duty, all-metal a taper bit adapter. Includes a drift pin (48-86-0120).