Sealing kit as it is also included with the BGM cylinder kit in the same scope of delivery. Contains three foot seals and one head seal. Sealing thicknesses foot seals: 0,2mm - 0,4mm - 0,6mm aluminum head seal: 0,5mm copper With the different thicknesses of the foot seal, the control angle can be finely adjusted to the respective purpose / stroke. Spacer columns made of aluminum are also available for the head for rough spacing.