"Recessed head fastener and driver combination".
It can be turned with an adjustable wrench, combination wrench and 6- or 12-point sockets.
"Means for uniting a screw with a driver".US Patent and Trademark Office.Patent 161,390, was issued to one Allan Cummings of New York City on March 30, 1875.Drive blades are about equal thickness.The main advantage to this drive system is that almost all of the turning force is applied at right angles to the fastener spline face, which reduces the possibility of stripping the fastener.56 Apple's first use of the pentalobe drive was in mid-2009 to secure the battery in the MacBook Pro.The screw heads are typically flanged, and may fit into standard Allen hex socket cap screw counterbores molded or machined into parts to be fastened.There are various other ways to categorize screw drives."When a Phillips is not a Phillips Plus So Much More!".52 In addition to breakaway bolts, breakaway nuts of similar design are available.Phillips drive bits are often designated by the letters "PH 11 plus a size code shemale roulette cam 0000, 000, 00, 0, 1, 2, 3, or 4 (in order of increasing size the numerical bit size codes do not necessarily correspond to nominal screw size numbers.
Alan Pritchard, Research Engineering Manufacturing Inc.
Its primary advantage over older gold rush casino waterford screw drives is that it resists cam out.