This Vitrex 10 2906 is a Professional 20mm Adhesive Round Notch Trowel, it has a rust resistant stainless-steel blade and a large, contoured handle with a soft grip to ensure comfort over prolonged use. The solid aluminium shank has 9 rivets and is designed to be used by the professional installer. Specifications: Blade Size: 115 x 280mm.Round Notches: 20mm. Vitrex Professional Notched Adhesive Trowel. Size: 115 x 280mm (11 x 4.1/2in)Sqaure Notches: 10mmAdditional Information:Notch Style: SquareNotch Size (mm): 10Blade Length (in): 11Blade Width (in): 4.1/2