1. Efficient and versatile: This 10piece TCT core drill bit set comes in various sizes (35mm, 40mm, 50mm, 65mm, 80mm, and 110mm) to meet different drilling needs, making it ideal for applications like water pipes, air conditioning pipes, and wall fans. 2. Quality: Crafted from quality alloy, these core drill bits are durable and longlasting. The tungsten carbide tip ensures clean, precise holes in concrete, brick, and block work, delivering performance and accuracy. 3. Comprehensive Set: This core drill set includes SDS attachments, guide drills, and a 300mm SDS extension shaft, providing everything needed to start drilling. The 10piece collection offers versatility and convenience with multiple sizes in one package. 4. Easy to Use: These core drill bits feature 2 locking screws and 2 guide drills, ensuring stability and userfriendly operation. The SDS Plus extension shaft allows for quick, secure attachment to drilling equipment, guaranteeing a smooth and hassle experience.