Columbia ONE Extendable Handle - Universal Fit for Corner Rollers, Angle / Corner Boxes, Angle Heads / Corner Finishers, Nail Spotters The new Columbia ONE Is an interchangeable handle system that allows one support handle to be used with Corner Rollers, Angle Boxes, Angle Heads, and Nail Spotters! The base handle C1H 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 Columbia handles the most ergonomic in the industry. The C1H features a D-shaped fitting that securely positions the handle in the Corner Applicator and positively prevents the tool from rotating during use.FITS ALL NEW TAPETECH TOOLS - HEAD SHAPE IS THE SAME AS TAPETECH AND THREADS ARE UNIVERSAL CORNER ROLLER PATTERN Columbia ONE Extendable Handle Features: Extends between 36" and 60" in multiple positions with the push of a button.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 Light-weight fiberglass and aluminum handle is sturdy but light enough to use all day with less fatigue