Bi Flex Sealing Trowel Recommended for fixing jointing tape. Bi-Flex technology Gradually rounded edges and corners to leave no trace. Thin and responsive - 40% lighter. Durable protective packaging for the blades. Technical description of the product Bi-Flex Sealing Trowel Hardened stainless steel blade, Thickness 0.4 mm - Wide concave base. Double row of rivets. Rubberised handle for comfort, polycarbonate frame for rigidity/lightness. Patent pending.