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Hole-Making-Head-Exchangeable Drills-Drill Body-Qd100-109-16-1.5D-Ca. Internal Coolant Channels: Highly polished drill bodies feature internal coolant channels for efficient chip removal. 6 Carbide Head Types: Available in 6 styles of carbide drill heads (QD-S1/A, QD-S2/A, etc.) for various applications. Wide Shank Range: Drill shank diameters available from 12mm to 32mm in multiple sizes. Multiple L/D Ratios: Available in 1.5xD, 3XD, 5xD, 8xD, and 12xD length-to-diameter ratios. Custom Inch Sizes: Inch sizes are made upon request to meet specific customer requirements. Fast Delivery Options: Delivery available from stock or within 25 days from the date of the order.