For pianos, there are some gradations of size, and several lengths are generally available, and unlike machine-screw sockets which have no taper, piano sockets have a slight taper, to fit tapered tuning pins.
L-shaped handles for pianos are available in several angles that are not quite right angles, provide greater leverage than T-shaped handles, and the angle provides clearance for the handle over adjacent pins, allowing a very short (and stiff) socket to be used. But pianos that have been neglected sometimes require additional tuning (called pitch raising) to achieve concert pitch (also called A440 or standard pitch). On very old pianos with rusty strings, first tuning the piano to itself is sometimes advisable to test the condition of the piano before adding greater tension.Tuning wrench, instruction book and gigbag included. LibraryThing2015 Digital Piano Best ReviewJust as you make a violin with standard sizes.A tuning wrench (also called a tuning lever or tuning hammer) is a specialized socket wrench used to tune string instruments, such as the piano, harp, and hammer dulcimer, that have strings wrapped around tuning pins. Other string instruments do not require a tuning wrench because their tuning pins or pegs come with handles (as with the violin), or geared tuning machines (as with the guitar or banjo).Dan Hawkins has been tuning and working on pianos since the age of 16.
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