Specifications: Diameter:20mm/0.79'',35mm/1.38'',50mm/1.97'' Height:12mm/0.47'' Thread:3/8" Description: MATERIAL STRUCTURE: Our conical reamer is coated with top-grade, which not only has excellent wear resistance, but also maintains long-term cutting performance. Ensure that processing hard materials makes your work easier MULTI-LAYER STRUCTURE: The unique multi-layer design enables the reamer to achieve smooth and gradual adjustment of the hole diameter during the drilling process, providing higher machining flexibility. We offer three different sizes to meet the needs WIDE APPLICABILITY:Whether it's concrete, tiles, marble, or engineered stone, our conical reamer can easily handle them, becoming an indispensable multifunctional tool in the hands of construction, decoration, and DIY enthusiasts, helping you easily complete various challenges IMPROVING WORK EFFICIENCY: Designed specifically to increase work speed, our conical reamer can quickly and reliably complete each hole expansion without manual intervention, helping you save time and improve production efficiency USER FRIENDLY DESIGN: This reamer is not only suitable for professionals, but also for hobbyists. It is suitable for workers, technicians, and mechanics, and is an important supplement to any drilling tool kit Package Includes: 1Piece Step Drill Bit