123hotchef
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What are these bell end used for as apposed to the standard center drill with a 60 degree angel?
https://www.ebay.co.uk/itm/dormer-5...000466&hash=item2a4bb23137:g:8ygAAOSwWKtUxkc7
https://www.ebay.co.uk/itm/dormer-5...000466&hash=item2a4bb23137:g:8ygAAOSwWKtUxkc7