Features 1、High-precision thread and tapered holes can be tightly attached to the tool. 2、The housing is treated with electrophoretic paint, making the product anti-rust even in worst environment. 3、By using specialized anti-thrust bearing to convert key-applied torque into superior gripping. 4、The clamping jaws are specially treated to improve wear resistance. 5、Enjoying super precision and durability. Specification Features: High-precision thread and tapered holes can be tightly attached to the tool. The housing is treated with electrophoretic paint, making the product anti-rust even in worst environment. By using specialized anti-thrust bearing to convert key-applied torque into superior gripping. The clamping jaws are specially treated to improve wear resistance. Enjoying super precision and durability. 1.5-10mm B12: 1.5-10mm denotes that clamp the drill between 1.5mm and 10mm, and B12 represents the hole behind the chuck is about 12MM taper. Specification: Condition: 100% Brand New Material: Stainless steel Clamping range: 1.5-10mm / 0.06-0.39in Package list: 1 * Drill Chuck 1 * Key Package List