apeTech XHTT is an interchangeable extendable handle system that allows one support handle to be used with Corner Rollers, Angle Boxes, Angle Heads, and Nail Spotters! The base handle XHTT fits the corner roller without adapters, as well as the new design corner applicator and nail spotter without adapters. The new, optimal 1.25" diameter makes TapeTech XHTT handles the most ergonomic in the industry. The XHTT features a D-shaped fitting that securely positions the handle in the Corner Applicator and positively prevents the tool from rotating during use. TapeTech XHTT Interchangeable Handle Features: Extendable from 43"-77" Lightweight and maneuverable at only 2.15 lbs Use a single handle with attachments for a variety of tools. 1.25" Diameter is comfortable and ergonomic D-Shaped fitting end that eliminates corner box movement.