Holder for hole enlargement

Holder A19 is used together with standard holders A1, A2 or A10 from Starrett when an already drill hole needs to be enlarged. Holder A19 then replaces the pilot drill by attaching a holesaw of the same diameter as the already drilled hole and using this as a new control together with the new diameter to be drilled. The smallest possible enlargement is 4.7mm between the pilot diameter and new drill diameter.