- SUQIN Hole Saw Set with 70 mm Hollow Drill Bit and 110 mm SDS Plus Adapter - Sturdy construction in carbon steel and YG8C carbide tip for precise cuts and long service life - Includes 2 x 110 mm pilot drill bits, SDS Plus adapter, set screw, and 140 mm combination wrench - Specially designed for drilling concrete, brick, masonry, and drywall panels - Facilitates the installation of recessed electrical outlets, HVAC systems, range hoods, and exhaust pipes - Chip removal holes eliminate dust during drilling, improving cleanliness and performance - Each piece is delivered in an individual plastic box and coated with oil to prevent oxidation - Compatible with most impact drills with SDS Plus chuck, ensuring versatility at work - It is recommended to avoid contact with metal reinforcements and to use coolant to prolong service life