Additional Drilling Equipment - Carbide Rock Drill Bit, Button Style, 1-1/2, BOART, Canada, New: This features 7 carbide buttons and a 1 ID Rope Style Z mounting thread. This bit is New; however some of the paint has rubbed off from storage. It measures 4 long and comes from an older inventory in our warehouse. Carbide button bits prove to be more effective in very hard rock when using heavier classes of rock drills. This rock drilling bit head is sold with the Kents Tools 30 Day Satisfaction Guarantee. Location: Tucson, Arizona. For complete listing information please select the Click To Bid button to see this item on eBay.