Reliable aluminium alloy material Constructed from strength aluminium alloy, this hole drill bit adapter offers sturdiness that resists damage during heavyduty use and provides longlasting performance. Userfriendly installation Designed for quick installation without the need for extra tools, enabling you to start your projects faster and more efficiently. Adaptable to many machines Tailored to fit mortising machines with a part width of about 20 mm and compatible with hole drill bits that have an exposed diameter of 3843 mm, delivering versatility across a range of tasks. Accurate and smooth drilling Enhances drilling accuracy and ensures stable operations that meet professional woodworking standards. Use scenarios Mortise joints in cabinet frames and tables: align with a mortising machine of 20 mm width and drill holes with an exposed diameter of 3843 mm for precise joinery. Reproducing or upgrading furniture: create identical mortises in solid wood for consistent fit and finish in chair legs, rails, or tabletop supports. Workshop upgrades for carpenters: quick tool changes and reliable hole alignment to improve efficiency on various drilling tasks.