10 Pieces of Barraquer Wire Speculum overall Length 40mm, Blades 14mm: This is an ophthalmic instrument used in retracting the eye lid and holding it open during surgery. This speculum is a lightweight, spring style, wire form instrument, therefore minimal pressure is placed on the eye. It is a self-retaining retractor available with solid blades. This product is the 40 mm Length Overall size speculum and has 14mm blades. The overall length is 40mm.