31pc Precision Screwdriver Bit Set, Material: Cr-V Package in storage plastic case It is usd for call phone, glasses,etc. 31pc Precision ... Screwdriver Set, Bits are made of Cr-V, package in storage plastic caseIt is usd for call phone, glasses, computer, etc ... . Contains:30pc 25mm Precison Bits1pc Precison ScrewdriverPacked with plastic case 31pc Precision Screwdriver Set