Features: Package includes 6 pieces, 6sizes magnetic bit holder, 300mm/11.81in,250mm/9.84in,200mm/7.87in, 150mm/5.91in,100mm/3.94in,60mm/2.36in to satisfy your various needs , with 1/4inch hex shank suitable size for easy use; The drill bit extension set is made of quality CR-V material， stable and strong, can stand high pressure; With fine workmanship, the smooth surfaces coatings can provide protect from damage against substances; Our drill bit extender is suitable for nut, batch head, electric screwdriver, etc; Magnetic extension bit holders with 1/4inch hex shank satisfy your various needs and easy to replace. Specifications: Material:CR-V 1set includes:1x300mm/11.81in Drill Bit Extension,1x250mm/9.84in Drill Bit Extension,1x200mm/7.87in Drill Bit Extension,1x150mm/5.91in Drill Bit Extension,1x100mm/3.94in Drill Bit Extension,1x60mm/2.36in Drill Bit Extension, Package Includes: 1Set Drill Bit Extension(6pcs) note: Please allow 1-2cm errors due to manual measurement,please make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.