The phrase "a handle which" is correct and usable in written English.
It can be used when referring to a specific handle or mechanism that serves a particular function or purpose.
Example: "The toolbox comes with a handle which makes it easy to carry."
Alternatives: "a handle that" or "a handle used for".
Note: lots of the best clutches come with a handle which can be tucked in and then pulled out when you're too bored/drunk to clutch.
Bartko stabilized the sub by venting air from its ballast tanks, and then Giddings turned a handle which released the safety belt that had held the Jim-suited aquanaut in place.
He saw taxes as being like club dues, which individuals were willing to chip into a central fund for the general good though "once taxes exist they become a handle which social powers grip in order to change the structure".
The tang would have been attached to a handle, which has not survived.
West became known especially for hitting important late-game shots, and Lakers' announcer Chick Hearn named him "Mr. Clutch" a handle which stuck with West for his entire career.
This mandrel is set with a handle which allows the user a firm grip to achieve high-pressure injection.
The council put a work-around in for bikes, a lane like a jug handle, which puts you at almost right angles to the tracks but involves waiting at a set of lights.
Replacement of the P2 quinoline with a triazole moiety provided a versatile handle which could be expediently modified to generate a diverse series of inhibitors.
This system can be applied to the existing doors with simple construction compared with the conventional systems using PIP joints for a door handle which need to embed a camera into a door.
This is all good but there is more: because HDPE is a plastic it can be made into complex bottle shapes, yielding a hollow handle which is better for grip, and a thin pouring lip, which means less drip.
A good tip is to make sure you start right at the end of the peg box by the scroll which creates a longer handle which is really useful if you play with a double hand, forehand or backhand.
