Easy to install: loosen the handle and insert the blade into the gap, then screw to tighten. To change the blade, rotate the penholder end to loosen the clamp, remove the blade carefully, insert the replacement, then rotate to lock. Made of metal and plastic with stainless steel fixed interfaces for solid construction. Features non-slip rubber rings for comfortable grip and a reinforced set screw for stability. Suitable for cutting tree limbs and branches. Comes with 3 different blade types for various materials, including penholder, pen cap, and 9 blades total. Widely used for pruning, carving, and cutting branches. Note: keep tools and materials safe during operation. Designed for cork, plastic, and Abs models not suitable for metal, hardwood, or high-strength materials.