Shears

Ideal for clipping hedges and topiary, shears are also practical for deadheading heathers, lavenders and cutting back herbaceous plants. There are several different designs: ‘sheep shears’ are ideal for fine-detail topiary.

 http://www.garden4less.co.uk/felco-2-secateurs-original.asp

Secateurs

These are designed for cutting herbaceous plants and deadheading and pruning woody stems up to 1cm (3/8in) in diameter (roses, soft fruit canes, shrubs). Attempting to cut larger stems tears and bruises the plant tissue and can also damage the secateurs. Always keep clean and dry when not in use and a good quality pair will last for year

 http://www.worldoffelco.co.uk/menu/301/Felco%20Secateurs.html

Loppers

Made to cut branches 1-2.5cm (3/8-1in) thick; loppers have long handles, offering extra leverage over secateurs. Sharpen lopper and secateurs blades using a whetstone to ensure clean cuts. Disinfect when pruning diseased plants.http

http://www.worldoffelco.co.uk/menu/302/Felco%20Loppers.html

Pruning saw

For larger branches and pruning in confined spaces between other stems use a pruning saw. Buy good-quality ones that fold. Their blades cut when pulled towards you. Replace blunted blades with new as they are difficult to sharpen. Keep these ultra-clean so they last and dont go rusty!

http://www.worldoffelco.co.uk/menu/305/Felco%20Pruning%20Saws.html