The largest screwdriver is owned by Thomas Blackthorne (UK). It
has an acrylic handle which measures 19.5 cm (7.6 in) at its widest
point and is 50 cm (19.6 in) long. The steel shaft is 25 mm (1 in)
thick and projects a further 51 cm (20 in), making the overall
length 101 cm (39.7 in).