One Mandrel Fits All Sizes! The Diablo DHSAR375 3/8" HEX Arbor with Bit & Nuts is part of Diablo’s new, high performance hole saws system that delivers faster cutting performance and increased productivity. Diablo Tool's hole saw system and mandrel design simplify the attachment process for fast and efficient hole saw mounting. These radical new hole saws provide ultimate cutting length to bore deeper holes in a single pass, tool-free plug ejection and Variable Tooth Design for faster cuts.Please Note: Diablo Tools products can only be sold and shipped to locations in the United States and territories. Additionally, these product cannot be sold to any person or company who will be reselling them to end users.