Crafted from high-strength thermoplastic, our knitting machine accessories are designed to endure high temperatures and resist abrasion, ensuring they maintain their shape and provide stable weaving performance over time. The package includes two knitting machine adapters and two 1/4" hex steel knitting machine drill attachments (50mm & 65mm), offering you ample backups for a seamless and worry-free knitting experience. These accessories are exclusively compatible with Addi knitting machines, specifically the 22-needle Addi Express and the 46-needle Addi Express King Size, ensuring a perfect fit and optimal performance. Please note, they are not compatible with Sentro or other brands. Installation is a breeze, taking just 3 seconds to attach or detach, making cleaning and maintenance effortless. The 1/4" hex drill bit design is universally compatible with any standard electric drill or screwdriver, requiring no modifications to your knitting machine. For the best results, we recommend operating at a speed of ≤180 RPM to prevent skipped stitches or yarn breaks, ensuring a smooth and consistent weaving process with your Addi knitting machine accessories.