Size: 3 different size wall hole saws (65mm, 50mm, 30mm) are prepared for different cutting diameters, an all-in-one choice for daily use. High Quality: Made of ultra-strong and durable carbide-tipped metal for years of use in the toughest conditions with uncompromising performance. Excellent Design: High-frequency welding technology, very strong welding openings, smooth welding mouth inside and outside. Wide Use: Suitable for any rotary hammer drill that accepts SDS-Plus shank. Excellent for drilling concrete walls, stone, brick, cement, masonry, aerated blocks, cast iron blocks, air conditioning installations. Attention: If there is a tile on one side of the wall, you must use a porcelain hole saw to drill the porcelain first, and then use the wall hole saw to drill holes. It is recommended that the porcelain hole saw is one size larger than the wall hole saws.