Material: carbon steel Size: 32 mm/1.26inch ,42 mm/1.65inch ,45mm/1.77inch Shape of the bits: round, square, hexagon. Efficient firewood splitting: firewood splitter drill bit is an efficient tool to help you split wood quickly,especailly small piece of wood, already thin,kindling,The smaller the piece the better it works.Thank you for understanding that too hardwoods,too wet woods and too large logs are hard to split; Suitable for soft woods: The log splitter has better splitting effect on soft and dry wood,such as pine,we do not suggest to split hardwoods such as oak logs, knotty woods or wet woods, if the wood is about 20cm wide, please split more times, you need to hold the wood in place to prevent it from turning with the bit; Easy to use: the key is to use it correctly,keep drilling straight and always start at the edge,do not drill into center at the first step,do not angle,if the log is too large over 20cm diameter, please firstly use other tools to split the log into half and then use this drill bit to slpit to save your time and effort; 32mm 35mm 45mm wood splitter drills on different types of power drills like hammer drill, impact drill, corded/cordless drill, you can easily get the job done like in the vedio if you use the right electric drills for soft and dry woods; Strong: The log splitter drill bits are well machined and made of high carbon steel,fine threading,it is exceptionally strong,very impact resistant and wear resistant,not to break,the head is to permeate to separate the wood,large powerful drill makes splitting firewood very fast even for hardwoods; About the power: 45mm log splitter is for heavy duty use,we suggest use on hammer drill,32mm log splitter is for light use,we recommend power above 750W for electric drill,power above 500W for hand drill,not suitable for the impact electric drill with pure electric drill function and three-jaw clamping drill bit. Package includes: 1 x Festberg drill + 3 x bits