TYPES OF SCREW HEADS NO FURTHER A MYSTERY

The polydrive screw travel, generally known as RIBE,[74] is spline-shaped with rounded ends from the fastener head. The Instrument has 6 flat enamel at equivalent spacing; the sizes are based on the diameter in the star details. The double-square generate is two squares superimposed at forty five° rotation, forming an eight-pointed star. The desi