The Starrett A19 Oops Hole Saw Arbor is a specialist accessory designed to enlarge existing holes without the need for a conventional pilot drill. This innovative arbor allows tradespeople to increase hole diameters by using a hole saw matching the existing hole size as a guide for the larger cutting saw. The A19 arbor replaces the standard pilot drill on your existing arbor system, enabling precise enlargement of holes with a minimum expansion of 3/16" (4.7mm). This makes it particularly useful for electricians and plumbers who need to modify existing penetrations for larger cables, pipes, or fixtures without starting a new hole from scratch. Manufactured by Starrett, this arbor offers broad compatibility across multiple hole saw ranges including FCH, DCH, TCT Multi Purpose, CT, and Diamond variants. The dual thread compatibility with both 1/2x20 and 5/8x18 threads ensures it works seamlessly with standard arbor systems commonly used across the UK trade sector. Features and Benefits: • Eliminates the need for a pilot drill when enlarging existing holes • Compatible with multiple Starrett hole saw types for versatile applications • Dual thread compatibility fits standard 1/2x20 and 5/8x18 arbors • Minimum enlargement capability of 4.7mm provides precise control Specifications: Min. Hole Enlargement metric: 4.7mm Min. Hole Enlargement imperial: 3/16" Compatible Threads: 1/2x20 & 5/8x18 Country of Origin: CN

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