Simple time saving idea - cut the pins to your desired height (Pins are calibrated, 5mm - 100mm), Pour screed/compound to level, pins are then held in place with their own strong adhesive tape on the bottom. Using these levelling pegs is a very time & cost effective way of building new subfloors or levelling old uneven floors. High adhesive strength. Engineered to stay straight up and locked in place during a pour. Easy to read 10-100 millimetre scale. No holes to drill. Bright yellow colour making them easily visible.