CITADEL TOOLS: KNIFECITADEL TOOLS: KNIFE This knife features a fully sculpted hard plastic handle, and incorporates a number of clever features for safety and convenience: Fixed single slot blade barrel, ensuring perfect alignment Ribbed shroud behind the blade, allowing safer downward pressure and maximum precision Ergonomic handle to reduce hand fatigue, and prevent rolling on your desk Back weighted design, so its less likely to fall with the blade down Blade changing