Certified Diameter Gauges for Shot & Hammer Officials. Neuff's Shot & Hammer Diameter Gauge set is essential equipment for Clerks of the Course and field event officials. Each anodised aluminium sheet features precision-cut circular slots to quickly verify the minimum and maximum legal diameters of shots and hammers across all weight categories — certified to within +/–0.2mm. Diameter Reference Table Weight (kg) Min Diameter Max Diameter 2kg 80mm 110mm 2.72–3kg 85mm 110mm 4kg 95mm 110mm 5kg 100mm 120mm 6kg 105mm 125mm 7.26kg 110mm 130mm Note: Masters weights should use the 7.26kg (130mm max) gauge for maximum diameter, as these differ from youth and senior female implements. Specifications Set of 6 sheets — covering all standard shot and hammer weight categories 3mm anodised aluminium — durable, lightweight, and corrosion-resistant Certified to +/–0.2mm — meets the precision required for competition use Image for illustration purposes only.