Metric headed (H) press-fit drill bushings come in standard sizes expressed in millimeters. Thin-wall headed press-fit drill bushings save space and can be placed closer together than standard-wall headed press-fit drill bushings.Headed press-fit (H) drill bushings have an overhang, or head, that prevents them from being pushed through the drilling jig, making them ideal for applications where axial loads or vibration could move headless drill bushings. The bushings can be installed with the head projecting above the jig plate, or they can be countersunk so the head is flush with the jig plate's surface. Type H drill bushings are permanently pressed into the jig and are suitable for single-step drilling operations where the bushings will not need to be replaced. Drill bushings are installed into a drilling jig to guide, support, and position a drill or other cutting tool during metalworking tasks. They keep the cutting tool from wandering or bending as it enters the workpiece, maximize chip clearance, and minimize the risk of marring the workpiece or the jig. Specifications: Item: Headed Press-Fit Drill Bushing (H)Drill Bushing Wall Type: Thin WallHead Type: YesMeasurement System: MetricInside Dia.: 10mmDecimal Equivalent: 0.3937Drill Size: #47Inside Dia. Tolerance: +0.0003\"/+0.0007\"Outside Dia.: 5/8\"Outside Dia. Tolerance: +0.0017\"/+0.0014\"Bushing Code: HMBushing Head Type: HeadedOverall Length: 1-1/4\"Head Dia.: 3/4\"Head Material: High Speed SteelHeat Treatment: Through HardenedMaterial - Machining: High Speed SteelRockwell Hardness: RC 62-64"