Good for Gear Head Builders: Bolt and Nut App
by brooklynmodern | August 25th, 2009
Just installed this cool iPhone app. Put a bolt up to the screen and measure its size and find the thread. There’s also a small ruler and a reference area that explains the different uses of screw drives, bolt markings, and screw-heads. Just make sure not to scratch your screen or get grease on it.
