Block Chalk Gross
Block chalk is a good wearing general purpose chalk. It comes in a block of 6 sticks. A stick is snapped off the block for use.
Each block is approx 25mm square x 70mm long. It comes packaged in an industrial corrugated carton of 144 sticks. White only.
Used for temporary marking of most substrates including steel, bitumen, tyres, concrete, timber and cardboard