Check the listing for details. Metric Ball Driver Set With "ProHold" Button Technology And Telescoping Magnet. Condition: New. Listed at 43.95 USD. Please visit my eBay store The latest in ball driver technology:Set of 5 Top-of-the-line Metric Bondhus "ProHold" Ball Drivers. Your order also ships with one Telescoping screw (and other parts) positioning Tool (5 inches to 26 inches) with a strong Neodymium magnet.Please don't compare these ball drivers to the less expensive "regular" non-ProHold Technology ball drivers. These are not your ordinary ball drivers!ProHold Ball Driver Set...the best ball drivers available anywhere at any price!: Great when working in hard to get at places. Simply the best, most advanced Balldrivers on the market! Here is a customized set of the 5 sizes. 1.5mm, 2mm, 2.5mm, 3mm, and 4mm. Fits all the popular RC hobby bolts and screws. You can view and print the Picture (chart) above, for your reference of screw sizes and matching ball driver size. This is the ultimate in Ball driver sets, and comes with a Lifetime Warranty.It's really a pleasure to work with the included ball driver; the very latest in Balldriver technology, "THE PROHOLD(tm) BUTTON". They lock in place for a true non-slip application. And, you can put the screw on the Balldriver first, and then place it where it goes! This is a major improvement over the "old style".