We aim to ship the same day if ordered before Noon Eastern Time 2 pack TCT Tungsten Carbide Tipped Pilot Drill For Drilling Concrete Stucco Brick Designed for our Tungsten Carbide Grit Hole Saws Tip creates 5/16" (8mm) Diameter Hole The Shaft is 1/4" (6mm) Diameter So also fits any Regular Arbors / Mandrels. The Important Stuff !!! We are a US Shipper based in Florida FL 34470 Everything we sell we have in Stock and we ship Fast. We Ship Free within USA using USPS First Class or Flatrate averaging 2-3 days. We have other options charged at cost at checkout if you need Express Delivery. International Shipping usually takes 7-14 days subject to custom delays in your Country. If you are happy with our service please tell a friend If you are not please tell us We will fix it if we can. We want your repeat custom About Me Page Sign up for my email newsletters You will be informed first of any new Products, Designs, Instructions, Videos or Inventions etc. Buy it Now Get Free Shipping !! These Pilot Drills are fitted with a piece of Tungsten Carbide Welded into the Tips. The tip is 5/16" (8mm) Diameter and the shaft is 1/4" (6mm) diameter so they will fit all of our Manrels Arbors both regular Hex end or SDS Fitting. They will also fit any other Regular Arbor / Mandrel that accepts 1/4" (6mm) shank diameter bit. The tip of these Pilot Drills means they can drill through hard abrasive products like Brick and Concrete and are designed to be used with a Hammer Drill. Notice our TCT pilots have a flat milled on them so the hex grub screw can hold very secure. These Pilot Drills were intended to be used in conjunction with our Tungsten Grit Edge Hole Saws so they can cut Tough Abrasive and Brittle materials like Brick, Masonry, Slate, Marble, Construction Materials such as Autoclaved Cement Board, Fibre glass, Composite Boards such as Chipboard and MDF, Laminates, Rubber Tyres, GRP, CFRP, Hardwood Flooring, Laminate Flooring, Plasterboard / Drywall, Soft Resinous Woods and Hard Brittle Materials. After All whats the Point Having a Hole saw that can cut the Tough Stuff if the Pilot Cannot? Check Out Our Store I Guarantee You Will Find "Another Amazing Product"