Pronese 10 Pack Super-Thin Open End Wrench Set,Carbon Steel with Mirror Polish,Metric,Including 6~27mm, Placed in A Rolling PouchPremium Quality: Carbon Steel with Mirror polish, 3 mm SUPER THIN wrenches but strong, chrome plated for rust resistance, heat treated for maximum strength and long lifespan. Good Helper: 3 mm SUPER THIN wrenches which let you reach fasteners in tight clearance. Useful especially in narrow spots where traditional wrenches cant reach. Precisely machined for a perfect fit on all fasteners, giving you maximum torque without slippage. Function: Two sizes