Deep Cut Carbide Tipped Hole Saw Kit For Thick Wall, Roof, Hardy Plank, Wood, Product Details The deep cutting carbide tipped hole saw set includes: 3pcs of 1-3/8?,2?,2-1/2?(35,51,64mm) hole saw , 1pcs of 7/16? hex shank mandrel, 3pcs of O0.315?(8mm) X 8.66" (220mm) pilot drill bits. The silver one is for wood and soft metal. The carbide tipped one is for stone. The rod is guide. Ideal for multiple materials: hard wood?not with nail), MDF, Fiber Glass, Wall Tile, Air Brick, Soft Brick, Plasterboard, For Thick Wall, Roof Max cutting depth:6.6 inch( 167mm). Cutting material MOHS hardness: NOT UP TO 6. For use in standard rotary drills, NOT for use in Hammer Mode. The carbide tipped comes from a famous European supply, is made with German automatic welding and grinding cutting edge machines, which has more shape ,better ring out and a longer life. Up to 5 times faster than standard bi-metal hole saw. Up to 10 times more cuts than standard bi-metal hole saw for wood. Replaced the following products: spade bit, Forstner bit, auger bit, bi-metal hole saw, diamond hole saw. The big slot design is to remove the plug easily. ?100% Satisfaction Guarantee? If you are not satisfied , Pls return to us. Payment We accept PayPal and credit cards via PayPal. Taxes - US We collect sales tax, as required by law. Shipping We make every effort of shipping within 3 business day of payment clearing. The estimated delivery time is 2 - 5 business days from the shipping date. Policies If you do need to return your item, please contact us via email (you will receive an email when your product ships with additional details - Subject: Important information about your purchase). You will then be provided with a return shipping label and packing slip. Pack the item carefully. Include the packing slip, apply the shipping label, and return the item within 30 business days of the date you request a return, or your return will be canceled. Once we receive your order we will inspect the return. Please allow up to 5 business days of receiving the returned item for your refund.