7721 Sure-Guide Variety Pack by Sure-Guide, Inc. SureGuide Variety Pack: 4 Pcs Variety Pack 1″,1-1/4″, 1-3/8″, 1-1/2″ “US & Foreign Patents Pending” Drill a perfect hole!. Posted in Drilling Tile & Stone, Guides & Accessories, Tile & Stone Tools tagged with Sure-Guide, Inc.