Drywall Corner Tool Handles are used in conjunction with corner rollers, corner finishers, and corner applicators during the finishing process. HEADS TO BE PURCHASED SEPARATELY, or as part of a complete assembly. DEWALT extendable accessory handles are precision machined using heavy gauge (but lightweight) extruded aluminium. The inside and outside tubes have been hard anodised for long term durability and easy cleaning. Our accessory handles also offer a unique design where the inside extension tube expands outward from the grip - so the ideal hand grip position can be maintained at all handle lengths. DEWALT drywall corner tool handles also feature a simple thumb-trigger adjustment mechanism for effortless handle length adjustment.