The draper expert 12 piece cobalt hole saw set is a professional grade cutting kit designed for drilling precise holes in a wide range of materials including steel, brass, bronze, cast iron, aluminium, wood and plastics. Manufactured from heavy duty steel with 8% cobalt content, this set delivers enhanced strength and durability for demanding applications where standard hole saws may struggle. The variable pitch tooth design reduces vibration and improves cutting performance, whilst the 38mm maximum cutting depth provides sufficient reach for most trade applications. The comprehensive size range from 20mm to 64mm diameter covers common requirements for electricians, plumbers, hvac engineers and general contractors, making it an ideal all purpose kit for professionals who need reliable cutting solutions across multiple materials. Each hole saw is supplied with two hex arbors covering 14 30mm and 32 152mm diameter saws, plus a 4mm hex key for secure fitting changes. The entire set is housed in a blow moulded plastic storage case that keeps the components organised and protected between jobs, helping prevent damage and ensuring you can quickly locate the right size when needed. Features and benefits bull 8% cobalt for extra strength and performance bull variable pitch teeth reduce vibration and improve cutting speed bull 38mm cutting depth suitable for most trade applications bull comprehensive size range 20, 22, 29, 35, 38, 44, 51, 57, 64mm diameter bull includes 14 30mm and 32 152mm hex. Arbors and 4mm hex. Key bull supplied inside a sturdy plastic storage case specifications cutting depth 38mm pitch 4.5 5tpi contents 9 x cobalt hole saws 20, 22, 29, 35, 38, 44, 51, 57, 64mm diameter 1 x 14 30mm hex. Arbor 1 x 32 152mm hex. Arbor 1 x 4mm hex. Key