Standard 1 inch weight plates for strength & conditioning – the cast iron weight plates are compatible with 1 inch standard barbells. Standard sizes barbells, dumbbells and weights are ideal for supporting high repetition strength and conditioning programmes.built to endure highly repetitive lifting – the weight plates are built from highly durable cast iron, designed to last for a long time, ideal for highly repetitive weightlifting movements such as squats, lunges, deadlifts & bench/chest press exercises.embossed weight identification - each weight plate features an embossed weight identifier, making it quick and easy to select weights for more efficient plate changes during weight training.compact space saving size for home and commercial gyms – cast iron weight plates have a higher density, meaning that the plates are more compact and smaller in size, ideal for space saving in home and commercial gyms.