The GEARWRENCH X-CORE Universal Socket and Joint Extensions are available individually in seven sizes ranging from 8mm to 15mm, or as a 7-pc set. Off-Corner Loading technology helps reduce the rounding of fasteners. The Universal Joint Extensions are available individually and in two 3-pc sets (3/8" or 1/2" drive) at 6", 9", and 12" lengths. Both the socket extensions and joint extensions feature high-visibility laser-etched markings for quick size identification, a 30 degree flex angle with 360 degree rotation and a black oxide finish for corrosion resistance.