Unlock Concentrate Lice and fly concentrate formulation provides up to 12 weeks fly control and as an aid in the control of cockle damage in all breeds of sheep. See below for dilution rates. Please email sales@ahdltd.co.nz to request a price. Also available from Farmlands PLEASE NOTE: This product is classed as DANGEROUS GOODS and NZ Couriers cannot deliver to a rural address. If your address is rural, you will need to pick up from your local NZ Courier depot. Read More