The Malco TSF2 Turbo Shear Backer Board Shear offers you powerful one hand operation cutting. The versatile TSF2 Turbo Shear accessory fits most 14.4 V or larger cordless or standard A/C power drills for easy operation anywhere.  Makes clean, precise cuts, (including window and door arches), in fiber cement siding and backerboard up to 1/2". The TSF2 features a wide skid plate design, which stabilizes the TSF2 for precise and clean cuts. Navigating curves, straight cuts and arcs are no problem for this shear while making less dust.