The HF fiberglass handle connects to TapeTech Corner Finishers (40TT, 45TT, 48TT, 48XTT) and Mud Heads (16TT and 16TT90) when finishing drywall. This durable, long lasting handle is most often used with the 40TT and 45TT corner finishers to wipe down internal corners after using the automatic taper and the 15TTE corner roller.