FastFix (FX) Keyless Chuck for the CXS/TXS, CXS/TXS 12 and CXS/TXS 18 cordless drills with FastFix interface.Specifications: Holder: FastFix Clamping Range: 1/32" (1 mm) to 3/8" (10 mm) What’s Included:(1) BF-FX 10 Keyless Chuck