Plug-in replaceable blades, System 4. 11-piece set of replaceable blades, all with same content Chrome-vanadium-molybdenum steel, hardened throughout, matt, chrome-plated Extendible 4 mm hex blades with colour-coded ChromTop® tips. 269 T11 01 - < 600-7647') 600-7647/. SoftFinish® extendible handle with ClickStop ball clamp Supplied in a black leather roll-up pouch. 2691 T11 ESD - < 660-8111') 660-8111/. SoftFinish® ESD extendible handle with ClickStop ball clamp Supplied in an ESD-protected roll-up pouch