material: stainless steel, this product is very durable, achieve perfect outside corners with easy inside corners. Package includes: internal + external corner trowel External corners: 40 mm / 1 .57in*145mm/5.7in inside corners: 40mm/1.57in*145mm/5.7in Inside corner trowel for finishing drywall and plaster, the perfect tool for tackling plastering corners giving the perfect 90 degree angle with minimal effort. PERFECT 90 CORNER SCULPTURE: The Inside Corner Trowel is your weapon for treat corner plastering and gives you the perfect 90 bend of wall corners with minimal effort. Finish small corners or lips around windows, doors and aesthetic grooves. The edges of the product are a little sharp. Before use, rub it with sandpaper or a grinding wheel to avoid hurting your hands.