There are two types of sealers. Front action and side action. FRONT ACTION sealers are held perpendicular to the strapping, usually in front of the operator who pushes the handles together close to the chest. Generally for light Duty Applications. The SIDE ACTION sealer has lower handles and can be rested on the flat surface of the unit being secured. Operators can then apply there bodys weight while cplosing the handles. The Side Action Sealer is generally used for heavier strapping applications.