Modular Drills Chamfering and Countersinking Order Planning Please utilise guide below to plan your TOP DRILL M1™ modular step drill based on your needs and requirements. Please contact your distributor for a quote. Option 1 TOP DRILL M1 Drilling and Chamfering Overall Length [L] Drill Length [L1] Shank Diameter [D] Drill Diameter Min [D1] Drilling Depth [DD] Cutting Diameter 2 Angle m Chamfering Depth [CD] Option 2 TOP DRILL M1 Drilling and Countersinking Overall Length [L] Drill Length [L1] Shank Diameter [D] Drill Diameter Min [D1] Drilling Depth [DD] Cut Diameter 23 [D23] Countersinking Depth [DD1] Cutting Diameter 2 Angle m U18 widia.com