مفتاح، ظرف المخرطة، مربع 9.5 مم

Finally, a chuck key that doesn't slip off the square drive. The 9.5 mm fit is snug and precise on my lathe's 3/8" chuck, making adjustments much easier than with my old worn-out key.

The 9.5 mm square drive fits my 3/8" chucks without any slop, so it turns smoothly instead of wobbling like the old one did. Solid enough for everyday use on the bench lathe without feeling flimsy.

Bought this to replace a worn-out key and the 9.5 mm square drive seats solidly in the chuck without any slop. The fit is snug enough that I don't worry about it rounding off the corners, and the length gives good leverage for tightening.