This adapter converts 1 1/4" UNC to SDS plus. Made of steel, sturdy and durable, not easy to break. Suitable for all hammer drills with SDS PLUS accessory. For core drills, UNC thread with SDS PLUS socket. Please check the compatibility of the accessories before purchasing. Attention! This is SDS PLUS, not SDS MAX! This adapter cannot be used in hammer mode. Note: The data are all manual measurements, please allow 1-3cm error. Due to the difference in light and display, there will be a certain color difference, subject to the physical object received. Delivery quantity: (according to the main picture)"