1/4 to 4mm Bit Adapter,2 Pcs 1/4 to 4mm Hex Adapter Magnetic and 2 Pcs 1/4 to 4mm Drill Extension Bit Holder for Micro-Bits. The 1/4 to 4mm bit adapter allows you to use the micro-bits by 1/4 inch bit driver,which can help you work more neatly,faster,and efficiently. The 1/4 inch to 4mm bit adapter with magnetic can hold the micro-bits tightly. The 1/4 to 4mm hex adapter is made of high quality steel,which is strength and durability. Please note: the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! Colour:Photo Color Material:Metal Package Contents: 2 x 1/4 to 4mm Hex Adapter Magnetic 2 x1/4 to 4mm Drill Extension Bit Holder for Micro-Bits Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.