To accurately set drill depth, simply place a DrillStop ring over the drill bit at the required depth, then drill until the ring is reached.
Metex DrillStop - Drill Hole Depth Indicator Pack of 18 (5 packs
Veritas Drill Stop Gauge - Lee Valley Tools
Metex DrillStop Hi-Vis Drill Depth Indicator 18 Pack - Screwfix
Veritas Drill Stop Gauge - Lee Valley Tools
The Alberti Drill Depth Stop - ALBERTI DESIGN
Saxton 10x PZ2-50mm Pozi-Drive 2 Impact Duty Screwdriver Drill
Metex DrillStop Hi-Vis Drill Depth Indicator Rings 18 Pack
Depth Stop Drill Bit, 18 Piece Drill Stop Collar Set Positioner
Depth Stop Drill Bit, 18 Piece Drill Stop Collar Set Positioner Ring
Steelex D2803 Plus Split Ring Depth Stop Set, 7-Piece
Using a rule to set a depth stop or countersink on a drill bit typically requires juggling all three items in one hand while tightening the hex key
Veritas Drill Stop Gauge
Veritas Drill Stop Gauge - Lee Valley Tools
Marxman Multi-Surface Drill Hole Marking Tool For 50-100mm Fixture
Corefix 100 Dot & Dab Wall Fixing 6 Pack c/w Drill Bit - Metex
70 Drill bits, Power tool accessories