This summer I made three mobile carts for my woodworking shop using lumber and hardware from the local Orange Home Center. I paid $8.98 for each 175 lb 3" caster with parking brake (and swivel). Weight limit. It's $35.92 for a set of four plus tax. I just completed another wooden cart and need to build another one so have I bought two sets of 4 sets of 3" locking casters (and swivel) from Best Service online valued at Β£250. Weight limit. Each pack of four casters is $23.99 or $6 per caster plus tax. I have tried used 3/8" hex head screws to mount the Online Best Service casters, but the pre-drilled holes were not very large (mounting hole dimensions: 0.32"). (8.3mm) x 0.46" (11.9 mm)) is enough to fit through the screw, instead I used 1/4" hex head screws to attach the casters to the carriage. Better Service's online scooter is very similar to the scooters sold at my local Orange Home Center, but Better Service's online scooters have better features and are SIGNIFICANTLY less money. So far I'm very happy with the price and quality. Only time will tell how well the wizard works. At least I have two different brands to compare. I ordered these videos on Thursday 25th October 2018 at 3pm (Prime) and they arrived on Saturday 27th October 2018. On Wednesday 31st October 2018 OBS customer support sent an email. So far so good and two thumbs up!