I USE THESE MAGNETS TO HOLD THE ROUND GAUGE TO THE BANDSAW. YOU WORK GREAT WITH THIS JIG. AND THEN CLOSE THE CONSTRUCTOR TO THE SIDE OF THE SAW FOR STORAGE. THE FORCE REQUIRED TO SLIDE IS MUCH MORE THAN WAS EVER USED FOR THIS JOB. THE ONLY PART OF THESE MAGES THAT IS CRAZY IS THE COST. WHEN YOU GET THE PAST THEY WORK GREAT FOR MANY COUNTLESS JIGS AND APPS. THE 40MM BIT WAS NOT THE KING IN THE SHOP BUT IT DID GREAT JOB CUTTING 3/4 PLYWOOD FOR INSTALLATION. EASY TO SHARPEN IF NEEDED,