Quahog rakes are long-handled and have narrow, concave tines, spaced closely together. Extend your rake and let it scratch the bottom, pulling it toward you, while you feel for the solid resistance of a living clam. Again, a little experience will teach you the feel of the thing. When you locate a clam, use the curved tines to root it out and lift it up to you. Using extension handles you can bullrake 15 feet of water from a skiff.
Quahogs are size-classed by cherrystones, littlenecks, chowders, etc.
The smaller they are, the tenderer they are. Eat 'em raw or steam them just until they open. They'll last up to a week in a bucket of salt water, if kept cool. Razor clams are not the usual target of shellfishers. The name comes from both the straight-razor shape and shell's edge.