One Comprehensive Platform Standard diameter range covering 12–68mm in 2 x D, 3 x D, 4 x D, and 5 x D. Four real cutting edges on each insert for entire platform. Eight insert sizes to cover complete diameter range. Easy to Apply No risk of mixing up inner and outer insert due to clear visual differences. Easy-to-change inserts, laser marked with geometries and grades. Easy-to-use nomenclature guide enabling the tool body and the related insert selection to avoid order failures. Highly Versatile Breadth of application capabilities include through and cross holes, inclined entry and exit opportunity, 45º corner, half cylindrical, concave, or chain drilling. Various geometries and grades available. WIDIA™ Top Cut 4™ (TC4) portfolio is a broad offering for customers looking for a versatile indexable drilling platform. widia.com