Bosch is coming out with new stop bits for masonry anchor installation that feature adjustable steel collars. The collared carbide-tipped bits will be available in 3/8″, 1/2″ and 5/8″ sizes, and with depth ranges from 13/16″ to 2-1/16″, which should cover more than 80% of drop-in anchor applications.
These bits are said to provide better accuracy than masking-tape flag stops and rotary hammer manual depth gauges, which it seems that some users do not even use.
Product Info via Bosch
Notice that Grainger / Drillspot have them for sale
http://www.grainger.com/Grainger/BOSCH-DropIn-Anchor-Stop-Bit-6LFJ2