Fastener installation bit

摘要

A driver bit for mounting in a sleeve (24) of a rotary driving tool for driving a slotted screw (28) having a hollow cap (30) with a threaded interior cylindrical wall (32) having an inner minor diameter comprises a driver portion (12) at one end thereof and a sleeve engaging portion (14) at the other end thereof, wherein the driver portion (12) includes a generally cylindrical aligning portion (16) with a predetermined diameter of between about 85% and about 99 ½ % of the inner minor diameter and a pair of laterally opposed concave surfaces tapering at a predetermined radius of curvature of between about 50% and about 150% of the inner minor diameter to a generally rectangular flat headed tip for engaging the slot (34) of the screw (28) while the generally cylindrical aligning portion (16) aligns the cap (30) and the screw (28) substantially coaxially with the bit. The invention is appropriate for securing hurricane shutters.