The SRP 18A/w is an ergonomic snap-off knife for all-round use such as cutting drywall, insulation and wood. The design with rubberized grip makes it suitable for materials demanding more power. Tapered for better visibility, access and control. The knife can hold a dispenser with 3 spare blades and is made of durable plastic with a steel core for added stability. 0.039″ (1 mm) thick medal blade rail for additional stability.