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)Square Notches: 4mmAdditional Information:• Notch Style: Square• Notch Size (mm): 4• Blade Length (in): 11• Blade Width (in): 4.1/2