BT40 WTE Standard 4.5° Shrink Fit Chucks offer a high-performance clamping solution, balanced to 25,000RPM G2.5. WTE Shrink chucks are 100% made in Germany and are used by leading Automotive, Aerospace and die & mould manufacturers across the world. The 4.5° profile is suitable for most milling & drilling requirements offering excellent clamping strength and rigidity with a much slimmer nose profile than conventional tool holders.