ZK21 series machines, designed for the level of the horizontal layout, using the gun drill tool. Mainly for small and medium sized rotary shaft parts in large quantities with the axis of the hole machining. With multi-spindle, multi-position design, which can drill more than just parts. Workpiece clamping way designed to diversify and configuration artifacts supplemental support mechanism, clamping fast and convenient, high processing efficiency, less overhead time. Cooling oil flow frequency adjustment, configure automatic oil cooler, automatic chip removal system.