CASTOR 5/16" THREAD ( PLEASE check THREAD SIZE ) Industry standard 6" is actually 51/2"/140mm TOP QUALITY CASTOR CASTORS ARE GREAT FOR CARPET AND HARD FLOORS. ( THEY COME IN BAGS OF 3 ) (YOU ARE ORDERING PER BAG OF 3) (** YOU ONLY PAY $1.50 FREIGHT PER BAG AFTER THE FIRST BAG PURCHASED **) QUALITY assured AND low PRICES ( PLEASE MEASURE YOUR THREAD SIZE LIKE SHOWN IN THE PICTURE ) PLEASE NOTE IF YOU CAN FIT A BIC PEN, OR A HB PENCIL INTO THE THREAD HOLE AT LEAST 2" / 50mm IT WILL BE A 3/8" THREAD NEEDED. IF IT WILL NOT FIT THROUGH IT IS A 5/16" THREAD NEEDED. PLEASE LOOK AT THE PICTURES PROVIDED OTHER SIZES AVAILABLE IN STORE BUY FROM INSIDE AUSTRALIA GET IT QUICK |