Buy Offer - Electromagnet

I Need a Small Electro Magnet to Hold 10 Kg to 20 Kg. Its Oprations are Above 1000 Times/ Minute. I Require in Rectangular Shape of 40 Mm X 40 Mm Approx. Height is No Constraint. Voltage is Variable and It Can Be Either Dc or Ac to Increase Strength of Holding from 10 Kg to 20 Kg. I Require for R & D Purpose. if It Suits We Can Give Bulk Orders.