Twin Lever Metal Bottle Capper from MoreBeer. I have this capper (See: Brewing Your First Extract Beer, Illustrated Step by Step). It works well and has a nice firm feel when capping. Because of the metal construction, I would probably choose this over ubiquitous Emily style level capper.
In action: Bottling a batch of Zythos IPA
Product Description – Here – Use coupon code BEERDEAL to get this discount.
Availability: This is a More Beer Deal of the Day. Quantities are limited. Check the Deal of the Day section – Here – to see if this is still available.