The Moore & Wright 900 Series Internal Micrometers comprise of a measuring head, a set of extension rods and a spacing collar to facilitate alternative measuring ranges. These models (901, 902 & 903) have detachable extension handles. All models supplied in a fitted case. These 900 Series Internal Micrometers conform to BS959 Standards.Select Option 2-12in (Imperial)25-55mm (Metric)50-210mm (Metric)50-310mm (Metric) Add to Basket Quantity