Features UNIVERSAL THREAD: This core drill has a 5/8-11 universal thread and can be easily and quickly mounted on a standard fixed core drill or hand drill. Excellent material: the core drill is made of excellent alloy steel, wear-resistant and durable. The diamond grinding grains can ensure a longer life of the core. HIGH PERFORMANCE This diamond core drill bit features chip removal holes, very even serrations and a concentric shank design for efficient operation. Easy to use: this hole opener can be used for both dry and wet drilling, drilling from vertical position and drilling at depth to meet a variety of requirements. Wide application: ideal for drilling holes in concrete, brick and marble, is widely used for installing air conditioners, plumbing, balustrades and buildings, etc. Specification: Item Type:Core Drill Material: alloy steel, diamond. Thread: 5/8-11 Drill diameter: approx. 108 mm / 4.25 inches. Length: approx. 240 mm / 9.5 inches. Package list: 1 x diamond drill 1 x positioning bit 1 x hex key 1 x saw blade 1 x seal Package List 1 x Diamond Bit 1 x Positioning Bit 1 x Hex Wrench 1 x Saw Blade 1 x Gasket